My request, vertical scrolling similar to IOS contacts app. Visible A-Z partition bars with a quick jump A-Z index control. But for phone Roon app, ensure the A-Z index jumper control is bigger than Contacts app so you can reliability click the intended letter to jump to (i.e. Contacts A-Z index control is too small).
Also, smaller icons in the vertical based lists. Look to Auralic Lighting DS for great examples of use of smaller icons for artist, album, track lists. Also, their implementation of ‘My music’ has the IOS contacts vertical browsing with A-Z index jumping.